Clamping device for jackets of presses



March 5, 1929. F. s. ENGLISH CLAMPING DEVICE FOR JACKETS OF PRESSES File d Sept. 1926 4 Sheet-Sheet 1 avwemtoz March 5, 1929. s. us 1,704,563

CLAMPING DEVICE FOR JACKETS 0F PRESSES Filed Sept. 2, 1926 4 Sheets-Sheet 2 j' I .I K

, 'uwntoz March 5, 1929. F. s. ENGLISH 1,704,563

CLAMPING DEVICE FOR JACKETS 0F PRESSES Filed Sept. 2, 1926 4 Sheets$heet 3 I I w avwpntoz fiww March 5, 1929. F. s. ENGLISH CLAMPING DEVICE FOR JACKETS QF PRESSES 4 Shets-Sheet 4 Filed Sept. 2, 1926 Patented Mar. 5,1929,

uirs *rs CLAMPING- DEVICE FOR JACKETS 0F PRESSES.

; Application filed September On presses used for cutting, creasing or scoring paper, cardboard, and similar stock in which the stock is carried around the surface of the cylinder, it is customary to provide a removable jacket of hard steel around the tympan or impression portion of the cylinder, against which the cutting, creasing and scoring rules may act upon the stock. In many cases it is desirable to have this jacket extend more than 180 degrees around the cylinder and as the jacket is usually shaped before it is applied to the cylinder, it has been customary, in order to apply the jacket over more than 180 degrees of the cylinder, to shape the jacket to the curvature of the cylinder and to forcibly snap thejacket over the cylinder; and to use a stripping or spreading mechanism for removingthe jacket from the cylinder. One serious objection to this method of handling the jacket is that it has a tendency to spring the jacket and increase its normal curvature making it of larger diameter than the cylinder. The object of my invention is to provide a method and device whereby the jacket, which is normally formed on a larger arc than the surface of the cylinder, is drawn down tight upon the cylinder to permit the use of a jacket which will extend around more than 180 degrees of the circumference of the cylinder. In the present case the device for accomplishing this is simple in construction and easy to operate. Other objects of my invention will be apparent from the following detailed descrlption.

In the drawings forming. part of this application,

Figure 1 is a sectional view showing in end elevation the cylinder of a cutting, creasing or scoring press having the jacket attached'in operative position,

Figure 2 is a similar View showing the jacket in the process of being tightened upon the cylinder,

Figure 3 is an end view of the cylinder showing the draw .down locking device,

Figure at is a detail view showing the stop device, and

Figure 5 isa sectional view of a portion of the cylinder showing the presentdevice in lan.

In the drawings I have shown only the impression cylinder of a press, together with my invention applied thereto, as it will be unnecessary to refer to the remainder of the press for an understanding of the present 2, i926. Serial'No. 133,212.

invention. In the drawings Ixhave shown an impression cylinder 1 and it is to be understood that the sheet which is to be cutor crease-d or scored is carried around with this cylinder while receiving the impression from the form. The jacket 2 consists of a sheet which is usually formed of thin, hard metal and under my present invention the sheet is shaped so that normally its arc of curvature is larger than the arc of curvature of the impression or tympan portion" 35 of. the cylinder. The leading edgeof the jacket may be attached'to the cylinder in any well known manner. In the drawings I have shown'a bar 3 to which the leading end of the jacket is riveted and this bar;rests in r w a socket 36 in a ledge 4 of the cylinder so that it lies within the peripheral line of the impression portion orltympanof the cylinder. The bar is shown held in position by means of clamps 5 mounted upon a shaft 37 and operated in any suitable manner to force the arms 38 of these clamps against the front of the bar?) to hold it in the socket of the ledge 4;. At each end of this bar 3 there is a fork-shaped hinge 6 which engages'with a stationary pintle 7 fixed in each end of the cylinder, the fork 6 being adapted to slide on the pins 7 sufficiently to permit the bar 3 to withdraw from the'socket of the ledge 4;

and for the hinges to swing upon the pins 7.'

I have shownthe customary-grippers 8 mounted upon thev gripper shaft 39. The purpose. of the grippers, as in ordinary practice, is to hold the forward edge of the sheet of stock against the leading edge of the acket 2. j

By the above means the leading end of the jacket is removablyattached to the cylinder and when it is desiredto remove the jacket from the cylinder the. clamps 38: are swung to the dotted line position .10 in Figure 2 to allow the bar 3 to'loe moved out of the socket 0b 36, whereupon the hinge members 6 may be disengage-d from the pintles 7 in the manner face of the cylinder; There is a series of members or hooks 11 each consisting of a shank portion 41 and an enlarged head 42 and theseare arranged at mtervalsacross the cylinder. The jacket is provided near its rear edge with as many apertures 12 as there are members 11, these apertures being sufficlent-ly large to receive the heads of the members 11. These members 11 are each mounted in clamps or levers 13 and I preferably make them adjustable therein, radially of the cylinder, in the manner shown in my said patent.

There is a shaft extending lengthwise of the cylinder and attached to the shaft are I eccentrics 14' corresponding in number with the number of clamping levers 13. Each lever 13 is provided with a tightening screw 16 threaded therein, the end of the screw being adapted toabut against the edge of the cylinder at the point There is a coiled spring 19 having one end attached to the lever 13 and the other end attached to a screw 43 in the cylinder and this spring has a tendency to draw the lever 13 in the direction necessary to keep the'screw 16 tight against the point 33. This construction is duplicated for each of the levers 13. Preferably, each eccentric 14 has flanges straddling the circular member 44 of the. lever 13 111. order to retain the'lever in the correct position on the shaft 15.

The leading edge of the jacket having been attached to the cylinder in the manner described the rear edge of the jacket will be separated from the cylinder as shown in Figure 2. The heads of tliemembers 11 will be inserted through the apertures 12 of the jacket, the screws 16 having been slacked off as shown in Figure 2, and the shaft 15 will be in such position as to cause the eccentrics 14 to hold the levers 13 in their projected position as shownin Figure 2. In tightening the jacket the screws 16 are turned to force the ends of the levers-13 away from the point 33 and this may be continued until the rear end of the jacket is drawn tight against the cylinder up to about the point 17. The shaft 15 maynow be turned about one-half revolution in the direction ofthe arrow 18 and the screws .16 may be further turned until the parts come into the position shown in Figure 1. The'ja'cket will then be held tight- 1y at all portions against the periphery of the cylinder, the tightening operation having reduced the are of curvature of the jacket to conform to that of the cylinder. In releasing the. rear end of the jacket it is merely necessary to slack oifthe screws 16 until the center of'the apertures 12 of the j acketregister with the center of the members 11 when the jacket may be sprung 011 these members. The springs 19 automatically return the levers 13 as the screws 16 are slacked off.

Before replacing the jacket upon the cylinder it is necessary to reposition the levers 13 by turning the shaft 15 in the direction of the arrow 20. i

vAny suitable means may be employed for turning and locking the shaft 15. In Figures 3 and 4 I have shown one means consisting in part of a ratchet 23 on one end of the shaft 15 and outside the cylinder. There is a pawl 24 pivoted on the stud 45 and the I point of this pawl is adapted to engage the teeth of a ratchet 23, the pawl being forced into the teeth of the ratchet by means of the spring 25. The pawl is provided with a handie 27 whichthe operator may grasp for the purpose of disengagingthe pawl from the ratchet to allow for the return movement of the latter. On the opposite end of the shaft 15 I have shown a collar 28 (see Figure 4) and this carries a pin 29 which is limited in its movement by the stop pins 30 and 31 in the cylinder to arrest the rotation of the shaft 15 and the eccentrics 14 in their extreme positions. IVhile these locking devices are shown at the ends of the shaft it is apparent that they may be placed at any other convenient position. lVhen the parts are in the position shown in Figure 1 the ratchet is not necessarily depended upon because the tension of the acket tends to move the members 11 in the direction of the arrow 32 andv the levers 13 fulcrum at the points of the screw 16 and this tends to rotate the shaft 15, but the movement is resisted by the stop pin 30 and therefore the shaft 15 is locked regardless of the presence of the ratchet 23. Iprefer, however, to provide the ratchet and pawl for lockingthe shaft in addition to theaction of the pin 30.

From the above it will be apparent that sion cylinder, a detachable jacket for, the periphery thereof, means for securing one end of the jacket to the cyllnder andmeans for securing the other end of the jacket to the):

cylinder, comprising a lever, means for shifting said lever substantially radially of the cylinder to draw on the end'of the jacket, and means for rocking said lever to draw on the end of said jacket.

2. In a press the combination of an impres sion cylinder, a detachable j acket for the pedescribed my invention, what I V iii) riphery thereof, means for securing one end of the jacket to the cylinder and means for securing the other end of the jacket to the III til

cylinder, comprising a lever, means for shiftmg said lever to exert a drawing action on the end of the jacket substantially radially of the cylinder, and means for rocking said lever to exert a drawing action on the end of the jacket substantially tangentially of the cylinder.

I 3. In a press the combination of an impression cylinder, a detachable jacket for the periphery thereof, means for securing one end of the jacket to the cylinder and means for securing the other end of the jacket to the cylinder, comprising a lever,a-n eccentric for shift-- ing said lever substantially radially of the cylinder, and means for rocking said lever to exert a drawing action on the acket substantially tangentially of the cylinder.

4:. In apress the combination of an impression cylinder, a. detachable jacket for the periphery thereof, means for securing one end of the jacket to the cylinder and means for securing the other end of the jacket to the cylinder, comprising a lever pivoted on a shaft and an eccentric for shifting the lever in relation to the shaft, and means for rocking said lever to exert a drawing action on the jacket.

5. In a press the combination of an impression cylinder, a detachable jacket for the periphery thereof, means for securing one end of the jacket to the cylinder and means for securing the other end of the jacket to the cylinder, comprising a lever, a shaft having an eccentric on which said lever engages whereby the turning of the shaft will shift the lever substantially radially of the cylinder, and a pawl and ratchet device for turn ing and locking said shaft.

6. In a press the combination of an impression cylinder, a detachable acket for the periphery thereof, means for securing one. end of the jacket to the cylinder and means for securing the other end of the jacket to the cylinder, comprising a lever, a shaft having an eccentric on which said lever engages whereby the turning of the shaft will shift the lever substantially radially of the cylinder, a pawl toexert a substantially tangential drawing' action on the end of'the jacket.

8. In a press the combination of an impression cylinder and a detachable jacket for the periphery thereof, means for securing one end of the jacket tothe cylinder and means for securing the other end of the jacket to the cylinder, comprising a pivotal member, and means for shifting the axis thereof in a direction substantially radially of the cylinder,

said pivotal member being adapted to draw the free end of said acket toward the surface of the cylinder, and means for rocking said pivotal member to exert a substantially tan:. gential pull upon'said jacket.

9. In a press the combination of an iinpres- I sion cylinder and a detachable jacket for the periphery thereof, having an aperture near the, end thereof,means for securing one end of the jacket to the cylinder, and means for securing the other end of the jacket to the cylinder, comprising a pivotal member having a headed pin for engaging in the aperture of said acket, means for shifting the said pivotal member in a direction substantially ra-- dially of said cylinder, and means for rock mg said pivotal member to exert a pull on said jacket substantially tangentially of said cylinder.

Signed at the city and county of New London, State of Connecticut, this 25th day of August, 1926.

. FRED s. ENGLISH. i 

